This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 31 |
| 5 | 131 |
| 6 | 733 |
| 7 | 5057 |
| 8 | 40339 |
| 9 | 362903 |
| 10 | 3628829 |
| 11 | 39916831 |
| 12 | 479001637 |
| 13 | 6227020841 |
| 14 | 87178291243 |
| 15 | 1307674368047 |
| 16 | 20922789888053 |
| 17 | 355687428096059 |
| 18 | 6402373705728061 |
| 19 | 121645100408832067 |
| 20 | 2432902008176640071 |
| 21 | 51090942171709440073 |
| 22 | 1124000727777607680079 |